Note 11 - Stock Options and Restricted Stock (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	For the Year Ended December 31,
		2017
Expected volatility		89	-	93%
Risk-free interest rate		1.4	–	1.5%
Dividend yield		-	-	-
Expected term (in years)		3.0	–	3.5

Share-based Payment Arrangement, Option, Activity [Table Text Block]

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2018		4,814,434		$	0.71		3.46	$	1,007
Granted		-			,
Exercised		(1,230,002	)		0.44		-		-
Forfeited or Expired		(1,039,767	)		0.71		-		-
Outstanding at December 31, 2018		2,544,665		$	0.85		2.54	$	93
Granted		-			-		-		-
Exercised		-			-		-		-
Forfeited or Expired		(599,332	)		1.78		-		-
Outstanding at December 31, 2019		1,945,333		$	0.55		1.95	$	-
Vested at December 31, 2019		1,892,332		$	0.56		1.94	$	-
Exercisable at December 31, 2019		1,892,332		$	0.56		1.94	$	-

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Shares			Weighted- Average Grant- Date Fair Value
Non-vested at January 1, 2018		2,531,599		$	0.24
Granted		-			-
Vested		(1,284,666	)		0.27
Forfeited		(653,100	)		0.22
Non-vested at December 31, 2018		593,833		$	0.20
Granted		-			-
Vested		(485,999	)		0.19
Forfeited		(54,833	)		0.22
Non-vested at December 31, 2019		53,001		$	0.22

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	Number of Shares			Weighted Average Grant- Date Fair Value
Restricted shares at January 1, 2018		-			-
Granted		1,042,500			1.07
Vested		(58,333	)		1.11
Forfeited		(147,500	)		0.72
Restricted shares at December 31, 2018		836,667			0.98
Granted		1,473,000			0.27
Vested		(43,334	)		1.28
Forfeited		(260,000	)		1.12
Restricted shares at December 31, 2019		2,006,333			0.55

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Year Ended December 31,
	2019	2018
Stock options	2,146,409	3,199,877
Warrants	113,904	668,071
Weighted average	2,260,313	3,867,948